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Novel polymeric oil-displacing agent for improving recovery ratio and application thereof

A polymer and oil displacement agent technology, applied in the field of new polymer oil displacement agents, to achieve good water phase permeability, high oil displacement efficiency, good temperature and salt resistance and shear resistance

Inactive Publication Date: 2012-07-11
SOUTHWEST PETROLEUM UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0013] The object of the present invention is to provide a kind of novel polymer oil displacement agent and its application for enhancing oil recovery, its principle is reliable, preparation method is feasible, can set up higher resistance coefficient and residual resistance coefficient in porous media, High oil displacement efficiency, effectively solving the temperature and salt resistance problems faced by polymers in the prior art

Method used

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  • Novel polymeric oil-displacing agent for improving recovery ratio and application thereof
  • Novel polymeric oil-displacing agent for improving recovery ratio and application thereof
  • Novel polymeric oil-displacing agent for improving recovery ratio and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] The preparation of embodiment 1 polymer oil displacement agent

[0046] 1. Synthesis of hydrophobic monomer dimethyl allyl p-hexadecyl benzyl ammonium chloride:

[0047] Add an appropriate amount of paraformaldehyde, anhydrous zinc chloride and concentrated hydrochloric acid into the three-necked flask, heat and stir, when the temperature rises to 60 ° C, add hexadecylbenzene, and quickly pass through the concentrated sulfuric acid and sodium chloride For the dry hydrogen chloride gas produced by the reaction, the amount of gas introduced is controlled by the dropping rate of concentrated sulfuric acid, and the excess gas is absorbed with water. The reaction is completed after 6 hours. After cooling, the liquid is separated in a separatory funnel, and the organic layer is sequentially washed with 10% aqueous sodium carbonate solution. Wash twice with distilled water for three times, then dry with anhydrous sodium sulfate, filter, distill off excess cetylbenzene, and fin...

Embodiment 2

[0052] Example 2 The temperature-resistant, salt-resistant and shear-resistant performance of polymer oil displacement agent

[0053] Get a certain amount of WSAP01~WSAP04 synthesized in Example 1 to be formulated into a solution. The composition of the prepared water used is shown in Table 1 and Table 2. The test instrument used is a Brookfield DV-III viscometer, and the test condition is a constant shear rate of 7.34S -1 , the polymer solution concentration is 2000mg / L, the experimental results are as follows Figure 1~4 Shown: The new polymer oil displacement agent has good temperature resistance, calcium and magnesium ion resistance and good shear resistance.

[0054] Table 1 Injection water composition

[0055]

[0056] Table 2 Composition of four kinds of brine

[0057]

Embodiment 3

[0058] Injection performance of embodiment 3 polymer oil displacement agent

[0059] Get a certain amount of WSAP03, WSAP05, and WSAP06 synthesized in Example 1, prepare a solution of 5000 mg / L with injection water, then dilute with injection water into a solution with a concentration of 2500 mg / L. Inject the polymer solution into a sand filling pipe with a length of 50.0 cm and a diameter of 0.8 cm with a pressure measuring point in the middle to investigate the injectability of the polymer solution and the ability to establish a resistance coefficient and a residual resistance coefficient. See the experimental results Figure 5-7 and shown in Table 3. From Figure 5-7 It can be seen from the figure that in the highly permeable porous medium, during the injection process of 2500mg / L WSAP03, WSAP05, WSAP06 polymer solutions, the pressure rises slowly and gradually stabilizes, showing good injectability and the ability to establish high flow resistance. After a large amount ...

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Abstract

The invention relates to a novel polymeric oil-displacing agent for improving recovery ratio and application thereof. The polymeric oil-displacing agent is a novel association polymer which has different hydrophobic monomers in different contents and is synthesized through free radical polymerization method by taking acrylic amide (AM)-acrylic acid (AA)-hydrophobic monomers as the reactant monomers, wherein the hydrophobic monomers include dimethyl-allyl-p-alkyl-benzyl ammonium chloride. The polymeric oil-displacing agent presents high viscidity under high temperature and high hypersalinity, so the polymeric oil-displacing agent is suitable for high-temperature and high-hypersalinity oil deposits. The polymeric oil-displacing agent has good temperature tolerance, salt tolerance and resistance to shear, and good injectivity and transmissibility as well as the abilities to build up good resistance coefficient and residual resistance coefficient, and can effectively improve the recovery ratio of crude oil. The oil-displacing agent is widely applicable in tertiary oil extraction field and has good market prospect.

Description

technical field [0001] The invention relates to a novel polymer oil displacement agent for enhancing oil recovery and its application. Background technique [0002] At present, polymer flooding technology is the main technology to enhance oil recovery in oilfield development. It is successful in technology and economy. It has been widely used at home and abroad, and has broad application prospects. [0003] In the current stage of oil and gas production, the stability requirements of water-soluble polymers are getting higher and higher, and the stability includes shear stability, chemical stability, thermal stability, biological stability and long-term stability. Specifically, water-soluble polymers can maintain a certain viscosity under the influence of high salinity, high temperature, high shear and different pH values. This is also an aspect that is currently being considered in the development of polymer oil displacement agents. [0004] In particular, polymer flooding...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/56
Inventor 施雷庭张健陈洪向问陶叶仲斌李晓南李纪晖程亮
Owner SOUTHWEST PETROLEUM UNIV
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